

A144796


Expansion of x(5+215x1253x^223x^3)/((1+34x+x^2)(134x+x^2)).


2



5, 215, 4517, 248087, 5212613, 286292183, 6015350885, 330380931095, 6941709708677, 381259308191447, 8010726988462373, 439972911271998743, 9244372002975869765, 507728358348578357975, 10667997280707165246437
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OFFSET

1,1


COMMENTS

The original definition "Numbers n such that (n^217)/2 is a square" describes A077242.  R. J. Mathar, Nov 27 2011


LINKS

Table of n, a(n) for n=1..15.


FORMULA

a(n)=1154*a(n2)a(n4).


MATHEMATICA

Rest[CoefficientList[Series[x (5+215x1253x^223x^3)/((1+34x+x^2)(134x+x^2)), {x, 0, 30}], x]] (* or *) LinearRecurrence[{0, 1154, 0, 1}, {5, 215, 4517, 248087}, 30] (* Harvey P. Dale, Apr 04 2014 *)


PROG

(PARI) Vec(x(5+215*x1253*x^223*x^3)/((1+34*x+x^2)*(134*x+x^2))+O(x^99)) \\ Charles R Greathouse IV, Sep 26 2012


CROSSREFS

Sequence in context: A055316 A203470 A165208 * A206457 A119657 A235456
Adjacent sequences: A144793 A144794 A144795 * A144797 A144798 A144799


KEYWORD

nonn,easy


AUTHOR

Richard Choulet, Sep 21 2008


STATUS

approved



